Citrus limetta, alternatively considered to be a cultivar of Citrus limon, C. limon 'Limetta', is a species of citrus, commonly known as mousami, musami, sweet lime, sweet lemon, and sweet limetta, it is a member of the sweet lemons. It is small and round like a common lime in shape. It is a cross between the citron (Citrus medica) and a bitter orange (Citrus × aurantium).

It is native to southern regions of Iran and also cultivated in the Mediterranean Basin.

• In Iran it is called limu shirin (لیمو شیرین, meaning 'sweet lemon' in Persian). Its juice is widely used throughout Iran in the fall and winter as a remedy for colds and flu.
• In India, it is commonly called mausambi, mosambi, or musambi in Hindi (मुसंबी or मौसंबी), musammi (ਮੁਸੰਮੀ) in Punjabi, mosambi (मोसंबी) in Marathi, moushumi or mushumbi lebu (মৌসুমী বা মুসুম্বি লেবু) in Bengali, satukudi or satukodi (சாத்துக்குடி) in Tamil, musambi (ಮೂಸಂಬಿ) in Kannada, battayi (బత్తాయి) in Telugu, chinikaya (చీనీకాయ) in Rayalaseema, and musambi (മുസംബി) in Malayalam.
• In Bangladesh, it is called musambi or mosambi (মুসম্বি/মোসাম্বি, in Bengali).
• In Nepali, it is called mausam.
• In Pakistan, usually, it is called musami (موسمى, in Urdu and Punjabi).
• In the Sindh, it is known as mosami.
• Among Iraqi Armenians, it is called noumi (նումի).
• In France, it is sometimes called bergamot; it should not be confused with Citrus bergamia, the bergamot orange.
• In the Dominican Republic, it is called limón dulce, lima dulce, dulce limeta, or limettioides dulces, because of this sweetness in these two citrus fruits.

It is a different fruit from the Palestinian sweet lime and from familiar sour limes such as the Key lime and the Persian lime. However, genomic analysis revealed it to be highly similar to the Rhobs el Arsa, and the two likely represent progeny of distinct crosses of the same citrus parents.

The South Asian cultivars originated in Mozambique and were brought to South Asia by the Portuguese. The common name musambi and its variants trace their origin to Mozambique.